@incollection{Graf2019,
  author    = {Johannes Graf},
  title     = {The Horological Industry in the 20th Century},
  series = {Ward Francillon Time Symposium 2019 Time – Made in Germany, 700 Years of German Horology. 12.-15. September 2019, N{\"u}rnberg, Deutschland},
  publisher = {Deutsche Gesellschaft f{\"u}r Chronometrie},
  address   = {N{\"u}rnberg},
  isbn      = {978-3-923422-28-9},
  pages     = {240 -- 259},
  year      = {2019},
  language  = {en}
}